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The application of CO2 in air source heat pumps has the advantages of environmentally friendly, non-toxic and harmless, and superior thermal performance, however, it still suffers from the problems of high system pressure and high compressor pressure ratio under large temperature span conditions in cold regions. To address these issues, a CO2 two-stage throttling intermediate complete cooling dual-compression cycle (TCDC) is adopted to improve cycle performance. Based on this, dynamic simulation modeling of the TCDC has been carried out using the Dymola software. The impact of different parameters, such as the low/high-stage compressor volume ratio (Rv), high pressure (PH), outlet temperature of gas cooler (Tgs,out) and evaporating temperature (TL), on the heating performance of the TCDC is analyzed, and the calculation formulas for the optimal low/high-stage compressor volume ratio (Rv,opt) is derived. The results show that the optimal low/high-stage compressor volume ratio (Rv,opt) of the TCDC depends solely on TL and has a significant impact on both the heating coefficient of performance (COPhot) and heating capacity (Qhot). Since the impact of Rv on system Qhot is greater than its impact on COPhot, the Qhot demand can be prioritized by adjusting Rv, laying the foundation for a heat priority control strategy.

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Analysis for Parameters Affecting Cycle Performance of CO2 Two-Stage Compression Cycles

  • 会议论文

  • 发表日期：

    2025年

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  • Aruna,
  • Xu Jin,
  • Zheng Qiu,
  • Zhongyan Liu,
  • Jiapeng Zhang,
  • Hao Zhang,
  • Xin Meng,
  • Xianglai Xu,
  • Wei Su

摘要

The application of CO2 in air source heat pumps has the advantages of environmentally friendly, non-toxic and harmless, and superior thermal performance, however, it still suffers from the problems of high system pressure and high compressor pressure ratio under large temperature span conditions in cold regions. To address these issues, a CO2 two-stage throttling intermediate complete cooling dual-compression cycle (TCDC) is adopted to improve cycle performance. Based on this, dynamic simulation modeling of the TCDC has been carried out using the Dymola software. The impact of different parameters, such as the low/high-stage compressor volume ratio (Rv), high pressure (PH), outlet temperature of gas cooler (Tgs,out) and evaporating temperature (TL), on the heating performance of the TCDC is analyzed, and the calculation formulas for the optimal low/high-stage compressor volume ratio (Rv,opt) is derived. The results show that the optimal low/high-stage compressor volume ratio (Rv,opt) of the TCDC depends solely on TL and has a significant impact on both the heating coefficient of performance (COPhot) and heating capacity (Qhot). Since the impact of Rv on system Qhot is greater than its impact on COPhot, the Qhot demand can be prioritized by adjusting Rv, laying the foundation for a heat priority control strategy.